I found an older thread about the same issue that said it was 75 characters...
All I can say is that I had no trouble using portable calibre from the external HD with the folder adjustments I made previously. The current path is actually slightly shorter now than the old one which worked and it still says it's too long. Though I attempted to open the other backup that had previously worked fine and that won't open now. No error message with it, just nothing happens when attempting to open it. Though it's possible I'm mis-remembering. I may never have attempted to run calibre from the external HD with that specific version and it may have been an older one. In any case, it did work at one point.
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